unsatisfiableness

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/**
 * Line path for bezier and straight line draw
 */
define(function (require) {
    var graphic = require('../../util/graphic');
    var vec2 = require('zrender/core/vector');

var straightLineProto = graphic.Line.prototype;
    var bezierCurveProto = graphic.BezierCurve.prototype;

function isLine(shape) {
        return shape.cpx1 == null || shape.cpy1 == null;
    }

return graphic.extendShape({

type: 'ec-line',

style: {
            stroke: '#000',
            fill: null
        },

shape: {
            x1: 0,
            y1: 0,
            x2: 0,
            y2: 0,
            percent: 1,
            cpx1: null,
            cpy1: null
        },

buildPath: function (ctx, shape) {
            (isLine(shape) ? straightLineProto : bezierCurveProto).buildPath(ctx, shape);
        },

pointAt: function (t) {
            return isLine(this.shape)
                ? straightLineProto.pointAt.call(this, t)
                : bezierCurveProto.pointAt.call(this, t);
        },

tangentAt: function (t) {
            var shape = this.shape;
            var p = isLine(shape)
                ? [shape.x2 - shape.x1, shape.y2 - shape.y1]
                : bezierCurveProto.tangentAt.call(this, t);
            return vec2.normalize(p, p);
        }
    });
});